fix: PartialSensorMeasure should be partial, added toString impls

metadata/src/main/java/net/laprun/sustainability/power/SensorMeasure.java

@@ -1,5 +1,7 @@
 package net.laprun.sustainability.power;
 
+import java.util.Arrays;
+
 /**
  * A power consumption measure as recorded by a sensor, recorded over a given period of time. The meaning of each component
  * measure is provided by the {@link SensorMetadata} information associated
@@ -70,4 +72,9 @@ default double externalCPUShare() {
      */
     SensorMeasure missing = new SensorMeasure() {
     };
+
+    default String asString() {
+        return getClass().getSimpleName() + '(' + startMs() + ',' + endMs() + " -> duration: " + durationMs() + ')'
+                + Arrays.toString(components());
+    }
 }

metadata/src/main/java/net/laprun/sustainability/power/measures/ExternalCPUShareSensorMeasure.java

@@ -32,4 +32,9 @@ public boolean isPartial() {
     public double externalCPUShare() {
         return cpuShare;
     }
+
+    @Override
+    public String toString() {
+        return asString() + " extCPU: " + externalCPUShare();
+    }
 }

metadata/src/main/java/net/laprun/sustainability/power/measures/NoDurationSensorMeasure.java

@@ -11,4 +11,8 @@
  * @param endMs the end timestamp in milliseconds for this measure
  */
 public record NoDurationSensorMeasure(double[] components, long startMs, long endMs) implements SensorMeasure {
+    @Override
+    public String toString() {
+        return asString();
+    }
 }

metadata/src/main/java/net/laprun/sustainability/power/measures/PartialSensorMeasure.java

@@ -13,4 +13,13 @@
  */
 public record PartialSensorMeasure(double[] components, long startMs, long endMs,
         long durationMs) implements SensorMeasure {
+    @Override
+    public boolean isPartial() {
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return asString();
+    }
 }